Pyrimidyl phosphoro-and thiophosphoroamidates

ABSTRACT

WHEREIN R1, R2, R3 and R4 are inter alia each alkyl, Q and Y are each oxygen or sulphur and Z is oxygen or &gt;NR5, wherein R5 is hydrogen or alkyl of 1 to 5 carbon atoms. The compounds possess insecticidal activity.   The present invention concerns novel pyrimidinyl phosphoric and thiophosphoric acid esters of the formula:

United States Patent [191 Milzner et al.

[ PYRIMIDYL PHOSPHORO-AND THIOPHOSPHOROAMIDATES [75] Inventors: Karlheinz Milzner, Basel; Fritz Reisser, Therwil, both of Switzerland [73] Assignee: Sandoz Ltd., Basel, Switzerland [22] Filed: Nov. 28, 1973 [21] Appl. No.: 419,508

Related US. Application Data [63] Continuation-impart of Ser. No. 230,043, Feb. 28,

1972, Pat. NO. 3,862,188.

[52] US. Cl ...260/256.4 E; 260/251 P;

260/256.5 R; 424/200 [51] Int. Cl. C07F 9/65; AOlN 9/36 [58] Field of Search... 260/251 P, 256.4 B, 256.5 R

[56] References Cited UNITED STATES PATENTS 2,754,243 7/1956 Gysin et a1. 260/251 P X 3,159,630 12/1964 Rigterink 260/256.4

FOREIGN PATENTS OR APPLICATIONS 2,144,392 3/1973 Germany Dec. 23, 1975 83,560 4/1954 Norway 260/251 P Primary Examiner-Donald G. Daus Assistant Examiner-Diana G. Rivers Attorney, Agent, or Firm-Gerald D. Sharkin; Richard E. Vila [57] ABSTRACT The present invention concerns novel pyrimidinyl phosphoric and thiophosphoric acid esters of the formula:

wherein R R R and R are inter alia each alkyl, Q and Y are each oxygen or sulphur and Z is oxygen or NR wherein R is hydrogen or alkyl of 1 to 5 carbon atoms.

The compounds possess insecticidal activity.

9 Claims, No Drawings PYRIMIDYL PHOSPHORO-AND THIOPHOSPHOROAMIDATES This application is a continuation-in-part of U5. Ser. No. 230,043, filed Feb. 28, 1972, now US. Pat. No.

The present inventionrelates to pyrimidinyl phosphoric and thiophosphoric acid esters.

The present invention provides compounds of formula I, i i

wherein R R and R which may be the same or different, are

each alkyl of l to 5 carbon atoms R is alkyl of l to 6 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, phenyl or phenyl substituted by at least one of chlorine, bromine and alkyl of l to 3 carbon atoms, Q and Y which may be the same or different, are

each oxygen or sulphur and Z is oxygen'or NR wherein R, is hydrogen or alkyl of l to 5 carbon atoms. The present invention also provides a process for the production of a compound of formula I which comprises reacting a compound of formula II,

wherein R R and Y are as defined above and M is hydrogen or a suitable cation, preferably hydrogen or an alkali metal or ammonium cation, with a compound of formula III,

Ill

wherein R R Z and Care as defined above and X is chlorine or bromine.

2 The process may, for example, be effected as follows viz.

The reaction may be effected in a suitable solvent eg an ester such as ethyl acetate, an amide such as dimethylformamide, an aromatic hydrocarbon such as toluene or xylene, a halogenated hydrocarbon such as chlorobenzene or chloroform, an ether such as dioxane or tetrahydrofuran, or a nitrile such as acetonitrile. The reactan ts are mixed at a temperature between 0 and l2 0Cpreferably at room temperature. In the case where M of formula II is hydrogen, an acid acceptor such as triethylamine or potassium carbonate may conveniently be employed. Preferably however M of for; mula II is sodium and the compound of formula II is employed immediately after the preparation thereof. It is preferably employed in dimethylformamide as solvent. Preferably also, X of formula III is chlorine and the compound of formula III is preferably employed in toluene as solvent. The reaction mixture may be stirred for between 1 and 6 hours, conveniently at an elevated temperature e.'g. between 40 and C. After the reaction, the reaction mixture may be allowed to stand before working up. Working up may be effected in conventional manner. l i

The compounds of formula I are obtained as colourless oils or crystalline compounds which may be characterised by melting point or Rf-value as appropriate. They are soluble in organic solvents and generally readily emulsified in water. a The compounds of formula II employed as starting material in the production of compounds of formula I, may be produced by reacting a compound of formula IV,

R and Y are as defined above and Me is sodium or potassium, and when required converting the resulting compound into a salt.

Thecompounds of formulae Ill and IV are described in the literature. 7 i

The compounds of formula lare useful because they possess biocidal activity. In particular, the compounds are usefulas insecticidesas indicated by an insecticidal effect in each of the following test viz:

Test i Effect against Carausius morosus (Indian rod locust) feed effect Tradescantia branches are immersed for 3.seconds in an emulsion containing 0.0 l 25% ofa compound of formula I, e.g.

0,0-dimethyl-O(2-ethyl-4-methoxy-pyrimidinyl-6)- thionophosphate, I 0,0-dimethyl-O-(2-ethyl-4-ethoiry-pyrimidinyl-6)- thionophosphate, 0,0-dimethyl-O-(2-methyl-4-ethoxy-pyrimidinyl-6)- thionophosphate, 0,0-dimethyl-O-(2-isopropyl-4-methoxypyrimidinyl)-thionophosphate,

0,0-dimethyl-O-( 2-n-propyl-4-ethoxy-pyrimidinyl- Y 6)-thionophos'phate,

and O-methyl-N-methyl-O-(2-n-propyl-4-methoxypyrimidinyl-6 )phosphorarnidate.

After drying the coating, each ofthe Tradescantia branches is inserted into a small glass tube filled with waterwhich is placed in aglass dish. 10 Carausius larvae in the second stage are placed in the glass dish which is then closed with a wiremesh lid. After 5 days the rate of mortality is determined as a percentageby counting out the live and dead insects.

Test ii Effect against Ephestia kuehniella (Flour moth) contact effect Petri dishes with a diameter of 7 cm, each containing caterpillars having a length of IO to l2 mm, are coated by spraying with 0.1 to 0.2 cc of an emulsion containing 0.05% of a compound of formula'l, e.g.

0,0-dimethyl-O(2-ethyl-4-methoxy-pyrimidinyl 6 )thionophosphate, 0,0-dimethyl-O-(2-ethyl-4-ethoxy-pyrimidinyl- 6)thionophosphate, 0,0-dimethyl-O-(2-methyl-4-ethoxy-pyrimidinyl- 6 )thionophosphate 0,0-dimethyl-O-(2-isopropyl-4-methoxy-pyrimidinyl-6)-thionophosphate, 0,0-diethyl-O-(2-methyl-4-ethoxy-pyrimidinyl- 6 )phosphate 0,0-dimethyl-O-(2-n-propyl-4-ethoxy-pyrimidinyl- 6)thionophosphate and O-methyl-N-methyl-O-(2-n-propyl-4-methoxypyrimidinyl-6)-phosphoramidate. The dishes are then covered with a fine mesh brass wire grid. After drying the coating, a wafer is given as food and renewed as required. After 5 days the rate of mortality is determined as a percentage bycounting out the live and dead insects.

Test iii Effect against Aphisfabae (black bean aphid) contact effect .4 0,0-dimethyl-O-(2-isopi'opyl-4-methoxy-pyrimidi- 'nyl-6-).thionophosphate, 0,0-diethyl-O-( 2-methyl 4-n ethoxy-pyrimidinyl- 6)phosphate, O,O-dimethyl-Q-(2-n-propyl-4-ethoxy-pyrimidinyl- 6)-thionophosphate and O-methyl-N-methyl-O-(2-n-propyl-4-methoxypyrim;idinyl,-6 )-phosphoramidate. The broad bean plants are strongly infected with all the 10 forms of developm ent of the black bean aphid (Aphis fabae). After 2 days the rate of mortality is determined.

Test iv.

5 Effect against Pahagrellus redivivus (paste nematode) 1 cc of an aqueous suspension of Panagrellus redivi vus, containing about 120 insects, is placed in a small cup having a diameter of5.5 cm and a height of 3.2 cm, and which contains 7 g of Terralite. 1 cc of an emulsion containing a compound of formula I, e.g.

0,0-diethyl-O-(2-ethyl-4-methoxy-pyrimidinyl 6)thionophosphate, 0,0-dimethyl-O-(2-isopropyl-4-methylthio-pyrimidinyl-6 )-thionoph,osphate, 0,0-dimethyl-O-(2-n-propyl-4-methoxypyrimidinyl-6.)-thionophosphate, 0,0-dimethyl-O-(2-n-propyl-4-ethoxy-pyrimidinyl- 6)-thionophosphate,

O,O-dimethyl-O-( 2-n-propyl-4-isopropyl-pyrimidinyl-6):-thionophosphate and I I O-methyl-N-methyl-Ofl 2 methyI-4-methoxypyrimidinyl-6 )-thionophosphoramidate, is spread over the Terralite. After 48 hours the content of the cup is examined in accordance with the extraction method of Baermann (G Baermann Meded. Ge-

neesk. Lab. Weltevreden 41 -47, l 9l 7),.and the live nematodes are countedout under a binocularmagnifying glass.

It is to be understood that the term insect as used herein is used in a broad sense and includes the class of animal organism Nematoda as well as the class Insecta. The term insecticide and insecticidal as used herein should be construed accordingly.

The compounds are also' characterised by very low mammalian toxicity as indicated by LD determinations.

For the abovementioned'use the amount of the compound to be applied will vary depending on the particular compound employed, the mode of application, ambient conditions and the effect desired. With regard to plant protection, in general a satisfactory amount to be applied to a plant locus is between 4 and I0 kg/hectare.

The compounds may be used in animal buildings, e.g. stables, inhabited rooms, e.g. cellars and 'attics, as well as in plant loci.

The compounds of formula I are particularly useful insecticides against I-Ierniptera and especially Lepidopherous' larvea, Coleoptera and Diptera. The compounds of formula I also show useful insecticidal activity against mosquitos. Particularly effective compounds of formula I are the compound of the formulae:

3 9 K NHCH and especially 3 0011 O-P NHCH 10 The compounds may be employed as a composition with insecticide carriers and diluents in solid or liquid form e.g. spraying and dusting powders, strewing granulates, spraying liquids and aerosols.

Solid forms may include carriers such as diatomal5 ceous earth, talc, caolite, attapulgite, pyrophyllite, artificial mineral fillers based on Si0 and silicates, lime, decahydrate and plant material carriers such as walnut and flour. Adjuvants such as wetting and dispersing agents, e. g. sodium-laurylsulphate, sodiumdodecyl ben- 2 zenesulphate, condensation products from napthalene sulphonate and formaldehyde, polyglycol ether and lignin derivatives such as sulphite liquor, may also be included in the case of wet-table powders to be applied as a water suspension. Granulates are produced by coating or inpregnating granular carrier materials such as pumice, limestone, attapulgite and coalite with the compounds.

Liquid forms may include non-phytotoxic diluents such as alcohols, glycols, glycolic ethers, aliphatic and aromatic hydrocarbons e.g. xylene, alkyl napthalenes and other petroleum distillates, and ketones e.g. cyclohexanone and isop'hoxone. Adjuvants such as surface active agents, e.g. wetting and emulsifying agents such as polyglycol ether formed by the reaction of an alkylene oxide with high molecular weight alcohols, mercaptans or alkyl phenols, and/or benzene sulphonates, may be included in emulsion concentrate forms.

Aside from the abovementioned carriers, diluents and adjuvents already mentioned, adjuvants such as 40 stabilizing agents, desactivators (for solid forms with carriers having an active surface), agents for improving adhesiveness to surface treated, anticorrosives, defoaming agents and pigments may also be included.

Concentrate forms of composition generally contain between 1 and 90% preferably between 5 and by .weight of active compound. 1 Application forms of composition generally contain between 0.02 and 90%, preferably between0.l and 20% by weight of active compound. 50 Examples of concentrate and application forms of composition will now be described:

a. Emulsifiable concentrate 25 parts by weight of a compound of formula I are mixed with 20 parts by weights of isooctylphenyldecaglycol ether, 5 parts by weight of the calcium salt of an alkyl aryl sulphonate and 50 parts by weight of xylene whereby a clear solution is obtained which may be readily emulsified in water. The concentrate is diluted with water to the desired concentration for use.

, b. Emulsifiable concentrate 25 parts by weight of a compound of formula I are mixed with 25 parts by weight of isooctylphenyloctaglycol ether, 5 parts by weight of the calcium salt of an alkyl aryl sulphonate and 45 parts by weight of an aromatic petroleum fraction having a boiling point of 2 l 0 to 280 (D 0.92). The concentrate is diluted with 3,928,353 7 water to the desired concentration for use. I I added dropwise and while stirring to the filtrate. The

l f rm mixture is stirred at 45 for a further 5 hours and is c. Spraymg and dustlng Powder apphcatlon allowed to stand over n1ght at room temperature. The

25 parts welght of a compound of 2 solvent is decanted as far as possible in a vacuum/high Paris by eight oflauryl sulphatef? l by welght of 5 vacuum. The residue is taken up in chloroform, is soqlum hgmile sulphonate are mlxfid Wlth 7O paints washed four times with 100 amounts of 1 N solution of weight of dlatolnaceolls earth and ground untll the sodium hydroxide and subsequently four times with grams have obtained a 5126 of as an average 100 cc amounts of water having a temperature of 8. The preferred compounds of formula I are those The chloroform phase is dried with sodium sulphate wherein Y is oxygen, particularly those wherein Y is 10 and optionally treated with animal charcoal. After filoxygen, Q is sulphur and Z is oxygen and those wherein tration it is concentrated in a vacuum by evaporation. Y is oxygen, Q is oxygen and Z is NH. The compound is obtained in the form of an almost The production of compounds of the invention will colourless oil. The degree of purity is examined on a now be described by way of Example. Temperatures silica gel thin layer plate with fluorescence indicator are indicated in degrees Centigrade. using ether as eluant. Rf-value =0.52. Chromatographical purification of the substance may be effected on a silica gel column with ether as eluant.

Analysis: C9H,5N2O4PS Molecular weight: 278.3

Calc. c 38.8% H 5.4% N 10.1% P 11.1% s 11.5%

Found 39.2 5.8 10.0 10.9 11.5

EXAMPLE 1 ;Q D 1 2 1 4- fi idi l- In an analogous manner to that described in Exam- 6) thionophosphate ples 1 and 2 the following compounds may be produced 4.8 g (0.1 mol) of sodium hydride (50% in mineral oil) are added while stirring vigorously and in the absense of moisture to 14 g (0.1 mol) of 2-methyl-4- 0 Z R. R2 R3 R4 Y methoxy-6-hydroxypyrimidine in 300 cc of absolute dimethylformamide. After stirring the mixture at room S 0 CH3 CH3 2 CH3 0 temperature for about half an hour solids are rapidly removed by suction and 16 g (0.1 mol) of 0,0-dimethylthionophosphoric acid chloride in 100 cc cf absolute toluene are added dropwise and while stirring to 5 0 CH3 CH3 the filtrate. The mixture is stirred at 45 for a further 5 hours and is allowed to stand over night at room temperature. The solvent is decanted as far as possible in a vacuum/high vacuum and the residue is taken up in S 0 CH CH O CH 0 ether and the etheral solution is concentrated by evaporation. The compound crystallizes in the form of colourless crystals having a M.P. of 66-67. The degree of purity is examined on a silica gel thin layer plate with S 0 CH3 CH3 O CH3 0 fluorescence indicator using ether as eluant. Rf-value 0.75. Chromatographical purification of the substance may be effected on a silica gel column with ether as eluant.

Analysis: C H N O PS Molecular weight: 264.24

Calc. C 36.4% H 5.0% N 10.6% P 11.7% S 12.1%

Found 36.8 5.1 10.7 11.7 12.1

EXAMPLE 2; S O H. 0

0,0-Dimethyl-O-(2-methyl-4-ethoxy-pyrimidinyl-6)- thionophosphate s 0 CH CH n.C l- CH 0 4.8 g (0.1 mol) of sodium hydride (50% in mineral s 0 n.C H, CH CH CH 0 oil) are added while stirring vigorously and in the absence of moisture to 15.4 g (0.1 mol) of 2-methyl-4- ethoxypyrimidine in 300 cc of absolute dimethylform- In the following Examples 3 to 51 the process for the amide. After stirring the mixture at room temperature production of compounds of formula I is analogous to for about half an hour solids are rapidly removed by that described in Examples 1 and 2. The compounds suction and 16 g (0.1 mol) of O,-dimethylthionophosare obtained as slightly coloured or colourless oils. ln phoric acid chloride in cc of absolute toluene are Examples 3 to 51 Q is sulphur and Z is ozygen.

: -continued t i Mole- Analysis Calc. Examplev Empirical cular RF- Found No. R R R R Y formula weight value* C H N P S I I I t I 47.9 7.4 8.0 8.8 9.0 48 CH CH C 11 C 11 O C H N O PS 340.3 0.40 49.7 5.0 8.2 9.1 9.4 49.9 5.5 8.7 8.6 9.1 49 CH CH CH C 11,, C H N O PS 278.3 0.66 38.8 5.4 10.1 11.1 11.5 A 39.2 5.9 9.8 10.7 10.7 50 CH CH CH C1 1: S C H N O PS 280.3 0.72 34.3 4.7 10.0 11.1 22.9 1 35.0 5.0 9.8 10.9 22.2 51 CH CH; CH; C 11 S c,.H,.N o Ps, 294.3 0.70 36.7 5.1 9.5 10.5 21.8 Y 37.3 5.4 9.3 11.0 22.3

') on silica gel thin layer plates with ether as eluant on silica gel thin layer plates with benzene/ether (6:4) as eluant vacuum. The =O-methyl-N-methyl-O-(2-ethyl-4- EXAMPLE I methoxy-pyrimidinyl-G)-thiophosphoroamidate is ob- 0,0-D1ethyl-O-( 2-methyl-4-methoxy-pyrimidinyl-6 tained as a crystalline mass which may be recrystallized phosphate from acetic ester. colourless crystals having a MP. of

7.2 g (0.15 mol) of sodium hydride (50% in mineral 5 l" to 53.5 are obtained.

Analysis: C l-l N O Ps Calc. C 39.0% H 5.8% N 15.2% P 11.6% S 11.2% Found 38.7 5.9 15.1% 11.5 11.2

oil) are added while stirring vigorously and in the ab- EXAMPL 5 sence of moisture to 21 g (0.15 mol) of 2-methyl-4- methoxy-6-hydroxypyrimidine in 400 cc of absolute h y p py y' dimethylformamide. After stirring the mixture at room temperature for about half an hour solids are rapidly removed by suction and 25.8 g (0.15 mol) of diethylphosphoric acid chloride in 100 cc of absolute toluene are added dropwise during the course of about 30 minutes and while stirring to the filtrate. The mixture is stirred at room temperature for about 4% further hours, is removed by suction and the filtrate is set free from the solvent in a vacuum/high vacuum. The residue is digested three times with 200 cc amounts of ether and the etheral solution is evaporated in a vacuum. The crude product may as far as possible bepurified immediately afterwards on a silica gel column with ether as eluant. The substance is obtained in the form of a colourless oil. The degree of purity is examined on silica gel thin layer plates with fluorescence indicator and ether as eluant. Rf-value 0.23.

Molecular weight: 276.2

Analysis: C H ,N,O P

Calc. C 43.5 H 6.2 N 10.1% P 11.2

Found 43.0 6.4 10.0 10.8

EXAMPLE 53;

O-Methyl-N-methyl-0-( 2-ethyl-4-methoxypyrimidinyl- 6 )-thionophosphoroamidate pyrimidinyl-o )-phosphoroamidate A solution of 14.33 g 0.1 mol) of O-methyl-N-methyl phosphoro-amidochloridate in 300 cc of toluene is added dropwise within v15 minutes to a solution of 19.0 g (0.1 mol) of the sodium salt of 2-isopropyl-4- methoxy-6-hydroxy-pyrimidine' in cc of absolute toluene; the reaction mixture is stirred'at room temperature for one f111'1h1'.l'10l11' and is subsequently heated to 50 for 8 hours. The reaction mixture is then cooled, washed 3times with 200 cc amounts of water until the pH value of the washings is 7, the toluene phase is dried over Na SO and the toluene is decanted at a rotatory evaporator. The O-r'nethyl-N-methyl-O-(2-isopropyl-4- methoxy-pyrimidinyl-6)-phosphoroamidate is obtained as yellow oil.

Molecular weight: 27

Analysis: C H MOJ 5.2

Calc. C 43.6 H 6.6 N 15.3 P 11.3 Found 43.9 6.7 15.3 11.1

duced viz;

0 z R R R R. Y

s NH on. cu A ca o -continued I Analysis Calc.% Exple. Empirical formula Found M.P. No. R R R R Q Y Molecular weight C H N S P [C] 291.3 40.9 6.4 14.2 11.1 10.9 90 CH CH iC -,l-I-, CH O C H N O P 43.6 6.6 "15.3 11.3 oil 275.2 43.3 6.8 15.3 11.2 91 CH CH CH CH S C H N OJS 34.4 5.1 15.0 23.0 11.1 56-60 279.3 34.7 5.3 14.8 22.7 11.4 92 C11; C11,, CH CH 0 S C H N O PS 36.5 5.4 16.0 12.2 11.8 64-67 263.3 36.2 5.5 15.8 12.0 11.5 93 CH CH C 11 C l-l S O C H N O PS 41.2 6.2 14.4 11.0 10.6 46.5-48

291.3 40.9 6.2 14.6 11.2 10.9 94 CH CH CH nC l-1 S S C 1-I N O PS 39.1 5.9 13.7 20.9 10.1 73.5-75

307.4 39.3 6.0 13.4 20.8 10.4 95 CH CH iC 1-1, C 11 S O C H N O PS 43.3 6.6 13.8 10.5 10.1 oil 305.3 43.0 6.6 13.9 10.2 10.1 96 CH CH C l-1 C H O O G l-1 N 0 43.6 6.6 15.3 11.3 oil 275.2 43.3 6.4 15.0 11.0 97 CH CH CH nC l-l, S O C l-l N o PS 41.2 6.2 14.4 11.0 10.6 45-47 291.3 41/1 6.3 14.2 11.2 10.3 98 CH CH C 11 nC H S 0 C l-l N o PS 43.3 6.6 13.8 10.5 10.1 43-45 305.3 43.1 6.7 13.5 10.8 10.3 99 CH CH nC 1-1-, nC H, S O C, H N O PS 45.1 6.9 13.2 10.0 99.7 oil 319.4 45.3 7.1 12.9 9.9 10.0 100 CH CH iC H, nC H-, S O C, 1-1 N O PS 45.1 6.9 13.2 10.0 9.7 oil 319.4 44.9 6.8 13.1 10.3 9.9 101 CH CH C 11 nC 1-1 S S C I-I N O PS 41.1 6.3 13.1 20.3 9.6 oil 321.4 41.3 6.4 13.4 20.2 9.4 102 CH CH CH iC l-l, S O c..,i-r N o Ps 41.2 6.2 14.4 11.0 10.6 011 291.3 41.0 6.4 14.6 11.2 10.9 103 CH CH C 11 iC 1-1 S O C I-1 N 0 PS 43.3 6.6 13.8 10.5 10.1 42-44 In analogous manner as described in Examples 53 and 54 the following compounds of general formula I were produced:

EXAMPLE 104:

O-Methyl-N-dimethyl-O-(2-ethyl-4-ethoxy-pyrimidinyl-6)-thionophosphoroamidate Slightly yellow oil EXAMPLE 106:

2-Methyl-4-ethoxy--hydroxypyrimidine 28.8 g (0.2 mol) of 2-methyl-4-chloro-6-hydroxypirimidine are added while stirring to a still warm solution of 9.2 g of metallic sodium in 140 cc of absolute ethanol. When a clear solution is obtained it is transferred into a heatable autoclave. After heating the Analysis: CHI-INNQOQPS Molecular weight: 305.3

Calc. C 43.3 H 6.6 N 13.8 S 10.5 P 10.1% Found 43.6 6.7 13.5 10.8 9.8

solution to 130 for 96 hours in the autoclave it is cooled down and the solvent is evaporated. The residue is dissolved in about 200 cc of water. Then the pH X M 105; value is adjusted to 6 with glacial acetic acid and while O-methyl-N-dimethyl-O-(2-ethyl-4-ethoxy-pyrimidinyl-6 )-phosphoroamidate Oil.

Molecular weight: 289.3

Analysis: C H N O P Calc. C 45.7

7.0 Found 46.0 7.2

STARTING MATERIALS stirring vigorously. Cooling to about 4 is effected and after about 10 minutes the obtained crystals which may be washed with a small amount of icewater are filtered off. The colourless needle shaped crystals may be recrystallized from water. M.P. l93-194.

Molecular weight: 1542 Analysis: C I-I N O Cale. C 54.5 Found 54.7

Calc.

Found Analysis Empirical Molecular Y formula weight C H Exam le No.

1 1. 1 o 1. 1 1 1 00 .l 11 9 9 8 .l 2 l.

l. .l. 1 .l 1 l. .l 1 2 1 .5154446]AA3331A3J4J33243JDDJDB fi 111.1.111111111111111111.1111111 211.1

2SIJJbJJlJJ plBlfiJS21222 1 1 777777777778888777777887788555566 6 933321334 2lu2 39 u4 u9213323- 24055 777699997699 99 77 76 99 66 4 4 555555555555666 55555566556666fi555 222222222222222MH wwmmwm%%mwm%m%mmu II -1111111111112 n fi o n n M Mddd Mm H H m CCcCCcCCcCCcCccCc 000 000 00000000000 a.. n mu n n m wnfl 5 HH w w c wcccc zuw CCCCwmmmmCnnnnCCQ Ha na m 5 5 C. a c H m. a 3 H H H Q H a H um nwnwCCnmCQCmQmCCC mmmmmmmmmmmmmmm Molecular weight: 184.2

In analogous manner as described for 2-isopropyl-4- methylthio-6-hydroxypirimidine (Example 124) the Analysis Calc. Molecular Found weight EXAMPLE 124:

2-Isopropyl-4-methylthio-6-hydroxypyrimidine 170 g (3.4 mols) of methyl mercaptan are introduced during the course of minutes into a clear solution of Example 76 g of sodium metal in 1500 cc of methanol; the solution is kept at 0 by cooling with ice. The mixture is stirred for about half an hour with cooling and the excess of methyl mercaptan is decanted at the rotatory evaporator. In a pressure autoclave there are added 258 g (1.5 mol) of 2-isopropyl-4-chloro-6-hydroxypyrimidine with 100 cc of methanol to the methanolic l60- l6l .351AAA201 3 77886677660088 11111111 Z Q O AmA A QZQA QQQQ 55445555554444 2 2 3 2 1w 2 1 40840060 wflwwwwfl SSSSS S zoz wp zoo. z o t z tN o M H H B B H H ccccccc SSSSSSS MHQ CHM CClnnCC 53-3 5 fl w wn wnnm ccCcccc 567890 nnnnnwu What is claimed is: l. A compound of the formula:

It is recrystallized from alcohol/water (6:4) and dried at solution of the sodium thiomethylate. The well closed autoclave is subsequently heated to for 24 hours, is cooled to room temperature and the solvent is decanted in a vacuum. The residue is dissolved in 300 cc of water and precipitated by adding glacial acetic acid. Removal by suction is subsequently effected at 5 wherein R R and R, which may be the same'or different, are

each alkyl of l to 5 carbon atoms, R is alkyl of l to 6 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, phenyl or phenyl mono substituted by chlorine, bromine or alkyl of l to 3 carbon atoms, Q and Y which may be the same or different, are

each oxygen or sulphur and Z is NR wherein R is hydrogen or alkyl of l to 5 carbon atoms. 2. A compound according to claim 1, wherein Q is sulphur.

3. A compound according to claim 2, wherein Y-is oxygen.

methyl. or ethyl, R is methyl or ethyl, R is methyl,

ethyl, n-propyl or i'sopropyl and R is methyl, ethyl, n-propyl or isopropyl.

8. The compound of claim 7, which is O-methyl-N- methyl-O -(2-n-propyl-4-methoxy-pyrimidinyl-6)-phosphoramidate.

9. A compound of claim 1, in which R is alkyl. 

1. A COMPOUND OF THE FORMULA:
 2. A compound according to claim 1, wherein Q is sulphur.
 3. A compound according to claim 2, wherein Y is oxygen.
 4. A compound according to claim 1, wherein Q is oxygen.
 5. A compound according to claim 4, wherein Y is oxygen.
 6. A compound according to claim 5, wherein Z is NH.
 7. A compound according to claim 6, wherein R1 is methyl. or ethyl, R2 is methyl or ethyl, R3 is methyl, ethyl, n-propyl or isopropyl and R4 is methyl, ethyl, n-propyl or isopropyl.
 8. The compound of claim 7, which is O-methyl-N-methyl-O-(2-n-propyl-4-methoxy-pyrimidinyl-6)-phosphoramidate.
 9. A compound of claim 1, in which R3 is alkyl. 